In runners if there is pain on the outside of the ankle joint and there is no history of trauma, then the more than likely reason is what is called peroneal tendonitis. The peroneal muscle group are on the lateral side of the fibula bone and there tendons pass around the outside of the ankle joint to then go to the outside and then the plantar aspect of the foot. The fundamental purpose of the peroneal muscles will be to stabilize and support the feet.
If a tendinopathy develops in the tendons of these peroneal muscles in runners, then the reason is most probably overuse. This is carrying out too much too early and the tendons aren't given to be able to adapt to the increasing stresses which are placed on them from that too rapid increase in the mileage as well as speeds being run. It is necessary that following harder longer runs that the body will be provided with ample recuperation before the next stress is applied. If a load is applied too early ahead of the tissues to have had time to restore, then there is a heightened chance to have an injury.
The pain of peroneal tendonitis generally just starts of as a insignificant ache, either just above or below the ankle joint bone on the outside of the ankle. To begin with there isn't any puffiness, but that will often develop later since the symptoms increases when the problem is not taken care of.
To deal with peroneal tendonitis, the runner needs to decrease the running to bearable levels to enable the peroneal tendons to get better. Podiatry practitioners often use a lateral wedge to take care of peroneal tendonitis for the short term because this lessens the activity of the peroneal muscles, so there can be less strain on the tendons. This goes underneath the heel in the running shoes. Right after the symptoms in the tendons starts to get better, then a gradual and slow increase is required in the distances run in order to enable the tendon to adjust to those stresses are important. A strengthening program is also very helpful.